linux-kernel - Re: [patch 4/6] ps3: Disk Storage Driver

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Date:	Sat, 16 Jun 2007 08:21:52 +0200 (CEST)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	David Miller <davem@...emloft.net>
cc:	alan@...rguk.ukuu.org.uk, dwmw2@...radead.org, axboe@...nel.dk,
	James.Bottomley@...elEye.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	paulus@...ba.org
Subject: Re: [patch 4/6] ps3: Disk Storage Driver

On Fri, 15 Jun 2007, David Miller wrote:
> From: Alan Cox <alan@...rguk.ukuu.org.uk>
> Date: Fri, 15 Jun 2007 17:15:45 +0100
> 
> > > > Any particular reason why this is done as a separate block device driver
> > > > rather than as SCSI?
> > > 
> > > Because no new fake SCSI drivers are accepted anymore.
> > 
> > Where did drivers/ata come from ;)
> > 
> > How about making it a fake ata driver if James is being fussy 8)
> 
> That sounds like a good idea for my virtual I/O case on
> Niagara too actually :-)
> 
> Another quirk I have to deal with is that under LDOMs you
> can export full disks and also just slices.  So I'll have
> to get down into the partition machinery to support that
> somehow.

The PS3 hypervisor also splits each device in regions (cfr. partitions), with
different access rights depending the OS that runs on top of it. The old
virtual SCSI driver treated each region as a separate LUN.

As currently only one region can be accessed by Linux anyway, I didn't bother
supporting multiple accessible regions in the new storage drivers.

With kind regards,
 
Geert Uytterhoeven
Software Architect

Sony Network and Software Technology Center Europe
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